
here is what they say onthere site
"all these coupons are offered for FREE. In exchange, we ask that you mail your extra coupons back to us, and recommend the site to others. Here you will find listings of all our available coupons for both the US & Canada (we have separate categories for each, so be sure you are searching in the right one :) We also have a large "CANADA ONLY" on all the Canadian coupons.
While you can pick as many individual coupons as you need, you can only order one each. If the expiry date is only a few weeks away, we will often lift the limits if we still have enough. Likewise, if we get an excess of some coupons because it seems everyone has sent one of them to us, we might lift the limits too.
How does it work? Think of it as a coupon train - we send you the coupons you want, and then we ask you send us coupons worth the same value back to us. You can also send us uncut inserts, if you are sending 15 pages of inserts or more. Remember, the more coupons you send us, the more people will use the service, meaning even more coupons are available for everyone!"
so visit there website to sere what coupons are avalible
http://www.momsbudget.com/coupons/